Grain growth behavior of blade steel KT5331 for ultra-super critical units
2015
LI Jun-ru | SONG Ming-qiang | GONG Chen | CHEN Lie | ZUO Hui | LIU Ya-zheng
The austenite grain growth behavior of KT5331 steel and the effect of precipitates on the austenite grain growth were studied by isothermal austenization at 950-1280℃. The results show that the austenite grain growth process can be divided into three stages. Due to the pinning effect of precipitates containing W and Nb,the austenite grains grow slowly below 1075℃. Most of the precipitates dissolve above 1075℃,leading to the austenite grains coarsened. When the temperature rises to 1225℃,δ-ferrite precipitates and results in austenite grain refinement with increasing temperature. The austenite grain growth models below and above the coarsening temperature 1075℃ were established by numerical fitting.
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